Elsey's previous deal with United expired at the end of last season, but new head coach Kurz has elected to keep him on board for their 2017/18 A-League campaign.

The 23-year-old has been training with United in recent weeks after making a recovery from a second serious knee injury. 

Elsey ruptured his ACL 11 months ago, which kept him out for the entire 2016/17 season. 

But after consultations with the Adelaide medical stuff, Kurz and the club elected to offer Elsey a new deal. 

The defender could make his competitive return on Wednesday as Adelaide face Newcastle Jets in the FFA Cup Round of 32.